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WO2010147426A2 - Procédé et système d'agencement de messages d'allocation de ressources pour réduire la complexité de décodage à l'aveugle dans des systèmes basés sur ofdma - Google Patents

Procédé et système d'agencement de messages d'allocation de ressources pour réduire la complexité de décodage à l'aveugle dans des systèmes basés sur ofdma Download PDF

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Publication number
WO2010147426A2
WO2010147426A2 PCT/KR2010/003948 KR2010003948W WO2010147426A2 WO 2010147426 A2 WO2010147426 A2 WO 2010147426A2 KR 2010003948 W KR2010003948 W KR 2010003948W WO 2010147426 A2 WO2010147426 A2 WO 2010147426A2
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WIPO (PCT)
Prior art keywords
region
resource allocation
sub
unicast
message
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Ceased
Application number
PCT/KR2010/003948
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English (en)
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WO2010147426A3 (fr
Inventor
Sudhir Ramakrishna
Kaushik Josiam
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Filing date
Publication date
Application filed by Samsung Electronics Co Ltd filed Critical Samsung Electronics Co Ltd
Priority to EP10789753.0A priority Critical patent/EP2443894B1/fr
Priority to CN201080027056.6A priority patent/CN102804897B/zh
Priority to JP2012515990A priority patent/JP5684803B2/ja
Priority to KR1020117030276A priority patent/KR101950780B1/ko
Publication of WO2010147426A2 publication Critical patent/WO2010147426A2/fr
Publication of WO2010147426A3 publication Critical patent/WO2010147426A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0038—Blind format detection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0014—Three-dimensional division
    • H04L5/0023—Time-frequency-space
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0037—Inter-user or inter-terminal allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0091—Signalling for the administration of the divided path, e.g. signalling of configuration information
    • H04L5/0092—Indication of how the channel is divided
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/046—Wireless resource allocation based on the type of the allocated resource the resource being in the space domain, e.g. beams
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L2001/0092—Error control systems characterised by the topology of the transmission link
    • H04L2001/0093—Point-to-multipoint

Definitions

  • the present application relates generally to wireless communications and, more specifically, to a system and method for blind decoding of resource allocation messages.
  • a certain geographical region is divided into regions referred to as cells.
  • the mobile stations (MSs) in each cell are served by a single base station (BS).
  • a BS transmits information to a particular MS (or a group of MSs) in its cell on the radio path referred to as the downlink (DL), while the MSs transmit information to the BS on the radio path referred to as the uplink (UL).
  • the transmissions on the UL and the DL may be on the same time intervals but on different frequency bands, referred to as frequency division duplexing (FDD), or on the same frequency band but during non-overlapping time intervals, referred to as time division duplexing (TDD).
  • FDD frequency division duplexing
  • TDD time division duplexing
  • the transmissions on the DL and UL are based on Orthogonal Frequency Division Multiplexing (OFDM) modulation.
  • OFDM modulation the available bandwidth for the radio link (DL or UL) is divided into a large number of smaller-bandwidth units referred to as sub-carriers (SCs), onto which the information to be transmitted is embedded.
  • SCs sub-carriers
  • MS(i) uses SC set ⁇ Si ⁇ to perform UL transmissions to the BS; and the SC sets used by different MSs are non-overlapping. Then, when received at the MS, the transmissions from MS(i) on SC set ⁇ Si ⁇ are not interfered with by any of the transmissions to the BS from any of the MSs j, where j ⁇ i.
  • the BS uses non-overlapping SCs to make simultaneous transmissions to different MSs, then at any MS, the transmissions meant for other MSs appear orthogonal to the transmissions meant for it.
  • the BS can transmit to MS(i) using SC set ⁇ Si ⁇ , and use non-overlapping SC sets to perform transmissions to various MSs. Then, when received at MS(i), the transmissions from the BS on SC set ⁇ Si ⁇ are not interfered with by any of the transmissions from the BS to any of the MSs j, where j ⁇ i.
  • This property of OFDM modulation allows simultaneous communications between several MSs and the BS on the UL, and the BS and several MSs on the DL.
  • a subscriber station capable of communicating with at least one base station in the wireless network.
  • the subscriber station includes a plurality of antennas; and a controller coupled to the plurality of antennas.
  • the controller is configured to receive at least one resource allocation message included in a resource allocation region.
  • the resource allocation region is partitioned into a plurality of sub-regions.
  • a first sub-region includes the resource allocation message.
  • the controller is configured to decode the resource allocation message and cease decoding upon reaching the end of the first sub-region.
  • a base station capable of communicating with at least one subscriber station in the wireless network.
  • the base station includes a plurality of antennas and a controller coupled to the plurality of antennas.
  • the controller is configured to transmit at least one resource allocation message included in a resource allocation region.
  • the resource allocation region is partitioned into a plurality of sub-regions.
  • a first sub-region includes the resource allocation message such that the subscriber station can decode the first sub-region and cease decoding at the end of the first sub-region.
  • a method for communicating with at least one base station in the wireless network includes receiving, by a subscriber station, at least one resource allocation message included in a resource allocation region.
  • the resource allocation region is partitioned into a plurality of sub-regions.
  • a first sub-region includes the resource allocation message.
  • the method also includes decoding the resource allocation message in the first sub-region. Further, the method includes terminating the decoding at the end of the first sub-region.
  • a method for communicating with at least one subscriber station in the wireless network includes transmitting, by a base station, at least one resource allocation message included in a resource allocation region.
  • the resource allocation region is partitioned into a plurality of sub-regions.
  • a first sub-region includes the resource allocation message.
  • the resource allocation message is configured to enable the subscriber station to decode the first sub-region and cease decoding at the end of the first sub-region.
  • FIGURE 1 illustrates exemplary wireless network 100 that is capable of decoding data streams according to embodiments of the disclosure
  • FIGURE 2 illustrates exemplary base station in greater detail according to embodiments of the present disclosure
  • FIGURE 3 illustrates an exemplary wireless mobile station according to embodiments of the present disclosure
  • FIGURES 4 through 8 illustrate processes for blind decoding by a subscriber station according to embodiments of the present disclosure.
  • FIGURES 1 through 8, discussed below, and the various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be construed in any way to limit the scope of the disclosure. Those skilled in the art will understand that the principles of the present disclosure may be implemented in any suitably arranged wireless communications system.
  • the LTE term “node B” is another term for “base station” used below.
  • the term “cell” is a logical concept that can represent a “base station” or a “sector” belonging to a “base station”.
  • “cell” and “base station” are used interchangeably to indicate the actual transmission units (may be “sector” or “base station” and the like) in the wireless system.
  • the LTE term “user equipment” or “UE” is another term for “subscriber station” or “mobile station” used below. It is noted that in all the following figures, some optional features are explicitly marked while some are omitted for clarity purpose.
  • FIGURE 1 illustrates exemplary wireless network 100 that is capable of decoding data streams according to one embodiment of the present disclosure.
  • wireless network 100 includes base station (BS) 101, base station (BS) 102, and base station (BS) 103.
  • Base station 101 communicates with base station 102 and base station 103.
  • Base station 101 also communicates with Internet protocol (IP) network 130, such as the Internet, a proprietary IP network, or other data network.
  • IP Internet protocol
  • Base station 102 provides wireless broadband access to network 130, via base station 101, to a first plurality of subscriber stations within coverage area 120 of base station 102.
  • the first plurality of subscriber stations includes subscriber station (SS) 111, subscriber station (SS) 112, subscriber station (SS) 113, subscriber station (SS) 114, subscriber station (SS) 115 and subscriber station (SS) 116.
  • Subscriber station (SS) may be any wireless communication device, such as, but not limited to, a mobile phone, mobile PDA and any mobile station (MS).
  • SS 111 may be located in a small business (B), SS 112 may be located in an enterprise (E), SS 113 may be located in a WiFi hotspot (HS), SS 114 may be located in a residence, SS 115 may be a mobile (M) device, and SS 116 may be a mobile (M) device.
  • Base station 103 provides wireless broadband access to network 130, via base station 101, to a second plurality of subscriber stations within coverage area 125 of base station 103.
  • the second plurality of subscriber stations includes subscriber station 115 and subscriber station 116.
  • base stations 102 and 103 may be connected directly to the Internet or other controller unit by means of a wired broadband connection, such as an optical fiber, DSL, cable or T1/E1 line, rather than indirectly through base station 101.
  • base station 101 may be in communication with either fewer or more base stations.
  • wireless network 100 may provide wireless broadband access to more than six subscriber stations.
  • subscriber station 115 and subscriber station 116 are on the edge of both coverage area 120 and coverage area 125.
  • Subscriber station 115 and subscriber station 116 each communicate with both base station 102 and base station 103 and may be said to be cell-edge devices interfering with each other.
  • the communications between BS 102 and SS 116 may be interfering with the communications between BS 103 and SS 115.
  • the communications between BS 103 and SS 115 may be interfering with the communications between BS 102 and SS 116.
  • base stations 101-103 may communicate with each other and with subscriber stations 111-116 using an IEEE-802.16 wireless metropolitan area network standard, such as, for example, an IEEE-802.16e standard. In another embodiment, however, a different wireless protocol may be employed, such as, for example, a HIPERMAN wireless metropolitan area network standard.
  • Base station 101 may communicate through direct line-of-sight or non-line-of-sight with base station 102 and base station 103, depending on the technology used for the wireless backhaul.
  • Base station 102 and base station 103 may each communicate through non-line-of-sight with subscriber stations 111-116 using OFDM and/or OFDMA techniques.
  • Base station 102 may provide a T1 level service to subscriber station 112 associated with the enterprise and a fractional T1 level service to subscriber station 111 associated with the small business.
  • Base station 102 may provide wireless backhaul for subscriber station 113 associated with the WiFi hotspot, which may be located in an airport, cafe, hotel, or college campus.
  • Base station 102 may provide digital subscriber line (DSL) level service to subscriber stations 114, 115 and 116.
  • DSL digital subscriber line
  • Subscriber stations 111-116 may use the broadband access to network 130 to access voice, data, video, video teleconferencing, and/or other broadband services.
  • one or more of subscriber stations 111-116 may be associated with an access point (AP) of a WiFi WLAN.
  • Subscriber station 116 may be any of a number of mobile devices, including a wireless-enabled laptop computer, personal data assistant, notebook, handheld device, or other wireless-enabled device.
  • Subscriber station 114 may be, for example, a wireless-enabled personal computer, a laptop computer, a gateway, or another device.
  • Dotted lines show the approximate extents of coverage areas 120 and 125, which are shown as approximately circular for the purposes of illustration and explanation only. It should be clearly understood that the coverage areas associated with base stations, for example, coverage areas 120 and 125, may have other shapes, including irregular shapes, depending upon the configuration of the base stations and variations in the radio environment associated with natural and man-made obstructions.
  • the coverage areas associated with base stations are not constant over time and may be dynamic (expanding or contracting or changing shape) based on changing transmission power levels of the base station and/or the subscriber stations, weather conditions, and other factors.
  • the radius of the coverage areas of the base stations for example, coverage areas 120 and 125 of base stations 102 and 103, may extend in the range from less than 2 kilometers to about fifty kilometers from the base stations.
  • a base station such as base station 101, 102, or 103, may employ directional antennas to support a plurality of sectors within the coverage area.
  • base stations 102 and 103 are depicted approximately in the center of coverage areas 120 and 125, respectively.
  • the use of directional antennas may locate the base station near the edge of the coverage area, for example, at the point of a cone-shaped or pear-shaped coverage area.
  • the connection to network 130 from base station 101 may comprise a broadband connection, for example, a fiber optic line, to servers located in a central office or another operating company point-of-presence.
  • the servers may provide communication to an Internet gateway for internet protocol-based communications and to a public switched telephone network gateway for voice-based communications.
  • voice-based communications in the form of voice-over-IP (VoIP)
  • VoIP voice-over-IP
  • the traffic may be forwarded directly to the Internet gateway instead of the PSTN gateway.
  • the servers, Internet gateway, and public switched telephone network gateway are not shown in FIGURE 1.
  • the connection to network 130 may be provided by different network nodes and equipment.
  • one or more of base stations 101-103 and/or one or more of subscriber stations 111-116 include a receiver that is operable to decode a plurality of data streams received as a combined data stream from a plurality of transmit antennas using an MMSE-SIC algorithm.
  • the receiver is operable to determine a decoding order for the data streams based on a decoding prediction metric for each data stream that is calculated based on a strength-related characteristic of the data stream.
  • the receiver is able to decode the strongest data stream first, followed by the next strongest data stream, and so on.
  • the decoding performance of the receiver is improved as compared to a receiver that decodes streams in a random or pre-determined order without being as complex as a receiver that searches all possible decoding orders to find the optimum order.
  • FIGURE 2 illustrates an exemplary base station in greater detail according to one embodiment of the present disclosure.
  • the embodiment of base station 102 illustrated in FIGURE 2 is for illustration only. Other embodiments of the base station 102 could be used without departing from the scope of this disclosure.
  • Base station 102 comprises base station controller (BSC) 210 and base transceiver subsystem (BTS) 220.
  • BSC base station controller
  • BTS base transceiver subsystem
  • a base station controller is a device that manages wireless communications resources, including the base transceiver subsystems, for specified cells within a wireless communications network.
  • a base transceiver subsystem comprises the RF transceivers, antennas, and other electrical equipment located in each cell site. This equipment may include air conditioning units, heating units, electrical supplies, telephone line interfaces and RF transmitters and RF receivers.
  • the base transceiver subsystems in each of cells 121, 122 and 123 and the base station controller associated with each base transceiver subsystem are collectively represented by BS 101, BS 102 and BS 103, respectively.
  • BSC 210 manages the resources in cell site 121, including BTS 220.
  • BTS 220 comprises BTS controller 225, channel controller 235, transceiver interface (IF) 245, RF transceiver unit 250, and antenna array 255.
  • Channel controller 235 comprises a plurality of channel elements, including exemplary channel element 240.
  • BTS 220 also comprises a memory 260.
  • the embodiment memory 260 included within BTS 220 is for illustration only. Memory 260 can be located in other portions of BS 102 without departing from the scope of this disclosure.
  • BTS controller 225 comprises processing circuitry and memory capable of executing an operating program that communicates with BSC 210 and controls the overall operation of BTS 220. Under normal conditions, BTS controller 225 directs the operation of channel controller 235, which contains a number of channel elements, including channel element 240, that perform bi-directional communications in the forward channels and the reverse channels.
  • a forward channel refers to a channel in which signals are transmitted from the base station to the mobile station (also referred to as DOWNLINK communications).
  • a reverse channel refers to a channel in which signals are transmitted from the mobile station to the base station (also referred to as UPLINK communications).
  • the channel elements communicate according to an OFDMA protocol with the mobile stations in cell 120.
  • Transceiver IF 245 transfers the bi-directional channel signals between channel controller 240 and RF transceiver unit 250.
  • the embodiment of RF transceiver unit 250 as a single device is for illustration only. RF transceiver unit 250 can separate transmitter and receiver devices without departing from the scope of this disclosure.
  • Antenna array 255 transmits forward channel signals received from RF transceiver unit 250 to mobile stations in the coverage area of BS 102. Antenna array 255 also sends to transceiver 250 reverse channel signals received from mobile stations in the coverage area of BS 102.
  • antenna array 255 is a multi-sector antenna, such as a three-sector antenna in which each antenna sector is responsible for transmitting and receiving in a 120E arc of coverage area.
  • RF transceiver 250 may contain an antenna selection unit to select among different antennas in antenna array 255 during transmit and receive operations.
  • BTS controller 225 is operable to execute programs, such as an operating system (OS) and processes for resource allocations, stored in a memory 260.
  • Memory 260 can be any computer readable medium, for example, the memory 260 can be any electronic, magnetic, electromagnetic, optical, electro-optical, electro-mechanical, and/or other physical device that can contain, store, communicate, propagate, or transmit a computer program, software, firmware, or data for use by the microprocessor or other computer-related system or method.
  • Memory 260 comprises a random access memory (RAM) and another part of memory 260 comprises a Flash memory, which acts as a read-only memory (ROM).
  • BSC 210 is operable to maintain communications between BS 102 and BS 101 and BS 103.
  • BS 102 communicates to BS 101 and BS 103 via the wireless connection 131.
  • the wireless connection 131 is wire-line connection.
  • FIGURE 3 illustrates an exemplary wireless subscriber station according to embodiments of the present disclosure.
  • the embodiment of wireless subscriber station 116 illustrated in FIGURE 3 is for illustration only. Other embodiments of the wireless subscriber station 116 could be used without departing from the scope of this disclosure.
  • Wireless subscriber station 116 comprises antenna 305, radio frequency (RF) transceiver 310, transmit (TX) processing circuitry 315, microphone 320, and receive (RX) processing circuitry 325.
  • SS 116 also comprises speaker 330, main processor 340, input/output (I/O) interface (IF) 345, keypad 350, display 355, and memory 360.
  • Memory 360 further comprises basic operating system (OS) program 361 and applications and/or instructions for decoding and interpreting resource allocations 362.
  • OS basic operating system
  • Radio frequency (RF) transceiver 310 receives from antenna 305 an incoming RF signal transmitted by a base station of wireless network 100. Radio frequency (RF) transceiver 310 down-converts the incoming RF signal to produce an intermediate frequency (IF) or a baseband signal. The IF or baseband signal is sent to receiver (RX) processing circuitry 325 that produces a processed baseband signal by filtering, decoding, and/or digitizing the baseband or IF signal. Receiver (RX) processing circuitry 325 transmits the processed baseband signal to speaker 330 (i.e., voice data) or to main processor 340 for further processing (e.g., web browsing).
  • IF intermediate frequency
  • RX receiver
  • Receiver (RX) processing circuitry 325 transmits the processed baseband signal to speaker 330 (i.e., voice data) or to main processor 340 for further processing (e.g., web browsing).
  • Transmitter (TX) processing circuitry 315 receives analog or digital voice data from microphone 320 or other outgoing baseband data (e.g., web data, e-mail, interactive video game data) from main processor 340. Transmitter (TX) processing circuitry 315 encodes, multiplexes, and/or digitizes the outgoing baseband data to produce a processed baseband or IF signal. Radio frequency (RF) transceiver 310 receives the outgoing processed baseband or IF signal from transmitter (TX) processing circuitry 315. Radio frequency (RF) transceiver 310 up-converts the baseband or IF signal to a radio frequency (RF) signal that is transmitted via antenna 305.
  • RF radio frequency
  • main processor 340 is a microprocessor or microcontroller.
  • Memory 360 is coupled to main processor 340.
  • part of memory 360 comprises a random access memory (RAM) and another part of memory 360 comprises a Flash memory, which acts as a read-only memory (ROM).
  • RAM random access memory
  • ROM read-only memory
  • Main processor 340 executes basic operating system (OS) program 361 stored in memory 360 in order to control the overall operation of wireless subscriber station 116. In one such operation, main processor 340 controls the reception of forward channel signals and the transmission of reverse channel signals by radio frequency (RF) transceiver 310, receiver (RX) processing circuitry 325, and transmitter (TX) processing circuitry 315, in accordance with well-known principles.
  • OS basic operating system
  • Main processor 340 is capable of executing other processes and programs resident in memory 360. Main processor 340 can move data into or out of memory 360, as required by an executing process. In some embodiments, the main processor 340 is configured execute programs, such as processes for decoding and interpreting resource allocations 362. The main processor 340 can execute processes for decoding and interpreting resource allocations 362 based on OS program 361 or in response to a signal received from BS 102. Main processor 340 is also coupled to I/O interface 345. I/O interface 345 provides subscriber station 116 with the ability to connect to other devices such as laptop computers and handheld computers. I/O interface 345 is the communication path between these accessories and main controller 340.
  • Main processor 340 is also coupled to keypad 350 and display unit 355.
  • the operator of subscriber station 116 uses keypad 350 to enter data into subscriber station 116.
  • Display 355 may be a liquid crystal display capable of rendering text and/or at least limited graphics from web sites. Alternate embodiments may use other types of displays.
  • the basic time unit over which the transmissions (from BS 102 to SS 111-116, and from SS 111-116 to BS 102) occur is called an OFDM symbol.
  • the transmissions by SS 111-116 are coordinated to ensure that non-overlapping SC sets are being used, and each SS has been instructed, by BS 102, as to which SC set to use for transmissions to BS 102.
  • BS 102 uses non-overlapping SC sets to make transmissions to SS 111-116, and the SSs are instructed, by BS 102, as to which SC sets to listen to receive the transmissions meant for them.
  • the instructions to the SSs are referred to as Resource Allocation Messages.
  • the resource allocation messages are transmitted by BS 102 on an SC set referred to as the Resource Allocation Region.
  • several resource allocation messages are carried on SCs that are part of the Resource Allocation Region.
  • Each of SS 111-116 is aware of the resource allocation region; and each of SS 111-116 receives, decodes and interprets the resource allocation messages in the resource allocation region to learn about the SC set the SS is to use for UL transmissions and/or the SC set on which the SS is to receive DL transmissions.
  • the SC sets that are available for transmissions by BS 102 to SS 111-116 on the DL, and by SS 111-116 to BS 102 on the UL, are classified into two broad categories: distributed resources and contiguous resources. It is first noted that a logical index of a resource is the index with which it is referred to in allocations, and which, along with a convention for translation to physical resources, allows a BS or an SS to determine which physical resource to which the allocation refers.
  • the resource allocation messages are referred to as MAP messages and the resource allocation region is referred to as the MAP-Region.
  • all the resource allocation messages that are possibly meant for several subscriber stations are jointly encoded, modulated and transmitted on the resource allocation region; pre-determined coding and modulation schemes, known to all subscriber stations, are utilized.
  • Each individual resource allocation message contains information regarding the subscriber station (or group of subscriber stations) for which the resource allocation is meant to allocate resources.
  • Each SS decodes this jointly encoded resource allocation to determine resource allocations for the respective subscriber stations. For example, SS 116 decodes this jointly encoded set of resource allocation messages, and, having access to all the resource allocation messages, identifies the ones that are meant for SS 116, and consequently identifies the resources on which SS 116 is meant to transmit and/or receive.
  • SS 115 decodes this jointly encoded set of resource allocation messages, and, having access to all the resource allocation messages, identifies the ones that are meant for SS 115, and consequently identifies the resources on which SS 115 is meant to transmit and/or receive.
  • This philosophy leads to simple decoding at the subscriber station , but is wasteful of resources, since it has to be ensured that the jointly encoded resource allocation message set reaches (i.e., is decodable by) all subscriber stations in the cell.
  • the IEEE 802.16e system utilizes this philosophy.
  • each of the individual resource allocation messages are encoded, scrambled and modulated separately, and then embedded onto the SCs in the resource allocation region.
  • a resource allocation message is scrambled in such a way that only the target SS for the resource allocation message (i.e., the one for which the message is specifying the resource allocations) is able to decode the resource allocation message, realize that the resource allocation has been decoded correctly, and then interpret the resource allocation.
  • SS 116 For example, consider a resource allocation message meant for SS 116. Then, only SS 116 can decode the resource allocation message (with some probability of error) and realize that it has decoded the resource allocation message correctly; after which SS 116 can proceed to interpret the decoded bits in the resource allocation message. Any other subscriber station, such as SS 115, when attempting to decode the resource allocation message, will be unable to do so, and will realize that it has been unable to decode the resource allocation message; as a result SS 115 will realize that that message is not meant for SS 115.
  • SS 115 does erroneously conclude that the message (which was not meant for SS 115) was meant for SS 115.
  • CRC Cyclic Redundancy Check
  • the first step is to calculate the value of a known linear combination of the information bits in the resource allocation message. This linear combination is referred to as the CRC.
  • the CRC value is XORed with an identification bit sequence which is unique to the intended subscriber station, where XOR refers to the binary exclusive-OR operation. This yields the scrambled CRC bit sequence. This scrambled CRC is then appended to the end of the information bits to form the complete payload in the resource allocation message.
  • a subscriber station after the decode attempt, then calculates the same linear combination on the resource allocation message information bits it thinks it decoded, and then XORes the calculated CRC with the scrambled CRC that was appended to the end of the information bits by the base station.
  • the set of resource allocation message information sizes and structure is defined and known to all subscriber stations.
  • Each SS attempts to decode the individual resource allocation messages in the resource allocation region, iteratively trying out each of the resource allocation message structure (size, modulation, coding) hypotheses.
  • This procedure is often referred to as blind decoding, with the “blind” referring to the fact that an SS attempts the decoding with no knowledge of (or a very limited knowledge of) the number and specific structures (size, modulation, coding) of the individual resource allocation messages in the resource allocation region.
  • a resource allocation message can be transmitted with the optimal modulation and coding for reception by a particular SS, taking into account the radio link quality between the BS and that SS.
  • FIGURE 4 illustrates a possible process for blind decoding by a subscriber station.
  • the blind decoding process 400 at SS 116 in the special case in which each of the resource allocation messages have the same size (i.e., the same number of information + CRC bits) and have been processed by the same Modulation and Coding Schemed (MCS), and consequently occupy the same size in the resource allocation region.
  • MCS Modulation and Coding Schemed
  • SS 116 starts blind decode attempts at the beginning of the resource allocation region. Knowing the resource allocation message (e.g., information + CRC) size is “S” and MCS is “M”, SS 116 knows that the resultant occupied size in the resource allocation region is S_M. Therefore, in block 410, SS 116 selects the first S_M block in the resource allocation region and attempts decoding using the size, modulation and coding. In block 415, SS 116 determines if the decoding was successful by checking the CRC. If the CRC check is not successful, SS 116 returns to block 410. If the CRC check is successful, SS 116 records the information in the decoded resource allocation message in block 420.
  • the resource allocation message e.g., information + CRC
  • SS 116 determines if the end of the resource allocation region has been reached in block 425. If the end of the resource allocation has not been reached, SS 116 returns to block 410 and selects the next block in the resource allocation and attempts another decoding operation. If the end of the resource allocation has been reached, the process ends in block 430.
  • FIGURE 5 illustrates a process for blind decoding by a subscriber station with a division of the resource allocation region into sub-regions.
  • the blind decoding process 500 shown in FIGURE 5 is for illustration only.
  • BS 102 partitions the resource allocation region according to the size of the resource allocation message and the MCS used to encode the underlying information in the resource allocation message.
  • one set of resource allocation messages are arranged contiguously in one portion of the resource allocation region.
  • Each set of resource allocation messages is of a certain size, i.e., containing a certain known number of information & CRC bits, and is processed by a certain and same MCS.
  • Each set of resource allocation messages is followed by a contiguous arrangement of another set of resource allocation messages with each resource allocation message in that set being of a known and possibly different size and processed by a possibly different MCS, and so forth.
  • Information regarding the composition of resource allocation messages in each region i.e., the information + CRC size of each message, & the MCS used to process it), the location of the beginning of each region, and the number of resource allocation message in each region, is made known to SS 111-SS 116. It may be noted that a resource allocation message with a known (information + CRC) size and a known MCS define a known size in the resource allocation region. Then, when performing the blind decoding operation in any region, SS 116 knows that all the resource allocation messages in that region are of a certain size and have been processed by a certain MCS, and therefore does not need to test for multiple resource allocation size or MCS hypothesis. This leads to a reduction in blind decoding complexity.
  • the region within the resource allocation region, consisting of resource allocation messages having the same size and processed by the same MCS, is referred herein as a resource allocation sub-region.
  • SS 116 is configured to know: the number of resource allocation sub-regions “R”; for each sub-region “r”, 1 ⁇ r ⁇ R; the size in the sub-region occupied by each resource allocation message is S_r; the MCS used to process each message in the sub-region is M_r; and the Number of messages in the sub_region is N_r.
  • SS 116 determines whether N_decode is greater than the number of message in the sub-region (i.e., N_decode>N_r?) in block 515.
  • SS 116 selects the next block of size S_r and attempts a decoding operation using MCS M_r.
  • BS 102 transmits several individual resource allocation messages to SS 116 in the resource allocation region. Two examples of situations where this may happen are as follows.
  • BS 102 makes a resource allocation on the UL, telling SS 116 which set of SCs to transmit on the UL, as well as a resource allocation on the DL, telling SS 116 which SCs to listen to on the DL for transmissions from the BS 102. Then, these two allocations may be carried in two separate resource allocation messages. This is an example where two different resource allocations are conveyed in two separate individual resource allocation messages.
  • BS 102 makes a resource allocation on the DL, telling SS 116 which SCs to receive BS 102 transmissions on. This resource allocation is carried on several individual resource allocation messages. SS 116 decodes each of the resource allocation messages, and then interprets the contents of the messages together to learn the resource allocation.
  • BS 102 uses several separate resource allocation messages (meant to be interpreted together) to convey a single resource allocation, as opposed to using a single resource allocation message to convey a single resource allocation.
  • resource allocation messages may not fit into a single resource allocation message, necessitating the use of multiple resource allocation messages to convey the resource allocation. This is an example where the same resource allocation is conveyed in multiple individual resource allocation messages.
  • the resource allocation messages can be broadly classified into two types based on whether they are directed toward exactly one SS or toward a group of SSs, as follows.
  • the two types are a Unicast resource allocation message and a multicast resource allocation message.
  • Unicast resource allocation messages are resource allocation messages transmitted by BS 102 that convey resource allocation information to a single SS, such as SS 116, controlled by BS 102.
  • SS 116 which is the targeted SS, can decode the message (with some error probability), detect that it has decoded it successfully, and interpret the message. Any other SS, such as SS 111-SS 115, will fail to decode the message, and will conclude that the message is not meant for the SS (again with some probability of false success).
  • Unicast resource allocations and the corresponding messages that covey them can further be classified into several types, based on the type of resource allocation they convey, such as:
  • Multicast resource allocation messages are resource allocation messages transmitted by BS 102 that convey resource allocation information to more than one SS, such as SS 111-SS 116, controlled by BS 102.
  • the group of SSs targeted by the multicast resource allocation message may be the set of all SSs in the cell (in which case the multicast resource allocation message is usually referred to as a broadcast resource allocation message), or the group of SSs could be any subset of the set of all SSs controlled by BS 102 (in which case the multicast resource allocation message is sometimes referred to as a group resource allocation message).
  • each SS in the target set can decode the message (with some error probability), detect that the SS has decoded the message successfully, and interpret the message (or portion of message that applies to it, based on some convention). Any other SS that is not part of the target group will fail to decode the message, and will conclude that the message is not meant for the SS (again with some probability of false success).
  • the multicast messages may also be classified into several more types.
  • Embodiments of the present disclosure classify messages as unicast or multicast by function, that is, by whether they convey resource allocation information to a single or many subscriber stations. Further, in any particular embodiment, the definition of a unicast or a multicast message may be implicit. As an example, in 802.16m-09/0010r2, Section 15.3.6.2.2.2, “Part 16 - Air Interface for Fixed and Mobile Broadband Wireless Access Systems; Advanced Air Interface (working document)”, resource allocation messages are classified into types, and the type of a message is carried as a field inside the message. In particular, there is a definition of a message type “DL Basic Assignment Message”, which is meant to convey a downlink resource allocation to a single mobile.
  • DL Basic Assignment Message DL Basic Assignment Message
  • a disadvantage of the blind decoding techniques can be that in order to learn about its resource allocations, SS 116 has to attempt to decode the resource allocation region in its entirety. Embodiments of the present disclosure seek to alleviate this disadvantage.
  • arrangement rules are utilized to define how the different resource allocations for an SS, carried by the respective resource allocation messages, are arranged in the resource allocation region, with a view to enable the early termination (i.e., termination before reaching the end of the resource allocation region) of the blind decoding operation in some cases.
  • a message arrangement order is utilized, which is the order in which the various resource allocations (i.e., the resource allocation messages that convey them) are arranged in the resource allocation region.
  • BS 102 knows and SS 116 is informed, or knows of, a “beginning of the resource allocation region”, “end of the resource allocation region”, and a “direction of resource blocks within the resource allocation region, leading from the beginning of the region to the end of the region, which is also the order of the SCs within the resource allocation region on which an SS would attempt successive blind decode operations”.
  • the resource allocation region is partitioned into sub-regions, each of which consist of resource allocation messages having the same size and processed by the same MCS, and that the details of the sub-regions (composition in terms of size, MCS and number of messages within) are known to all SSs, as discussed herein above with respect to FIGURE 5.
  • all the unicast resource allocation messages for a particular subscriber station exist only in one of the sub-regions of the resource allocation region. Further, the convention is not explicitly communicated to the BS 102 to any SS, such as SS 111-116, regarding the presence or absence of a unicast resource allocation message meant for that SS in any sub-region.
  • a sub-region is, as defined before, a portion of the resource allocation region containing resource allocation messages, all of which are of the same size and have been processed by the same MCS.
  • the unicast message is a message that contains resource allocation information meant for only one subscriber station, and is meant to be decoded only by that subscriber station.
  • SS 116 Once SS 116 successfully decodes the unicast message in a particular sub-region, SS 116 knows that no unicast messages exist for SS 116 in any other sub-region. Therefore, when attempting to decode the unicast messages meant for SS 116, SS 116 need not attempt to blindly decode any subsequent (following) sub-regions in the resource allocation region.
  • FIGURE 6 depicts the blind decoding process 600 in one example where all resource allocation messages in the resource allocation region are of the unicast variety, i.e., no multicast assignments exist.
  • FIGURE 7 illustrates the process for blind decoding by a subscriber station in the situation in which the resource allocation region may contain both multicast and unicast messages according to embodiments of the present disclosure.
  • the blind decoding process 700 shown in FIGURE 7 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • all the multicast resource allocation messages if they exist, occupy a contiguous portion of the overall resource allocation region, starting from the beginning of the overall resource allocation region, and possibly spanning several sub-regions. Accordingly, if one traverses the resource allocation region from the beginning to the end in increasing resource block index, all the multicast messages, if they exist, occur prior to the occurrence of the first unicast message.
  • the convention for the blind decoding process 700 shown in FIGURE 7 is not explicitly communicated to the subscriber stations.
  • Both the unicast and multicast messages may occur in the resource allocation region. If both unicast and multicast messages occur in the resource allocation region, then once SS 116 decodes a unicast resource allocation message in any sub-region, SS 116 knows that any multicast messages meant for SS 116 have already been encountered, and also that all unicast messages meant for SS 116 occur in the same sub-region. Therefore, SS 116 may terminate blind decoding after reaching the end of the current sub-region, since the following sub-regions will not contain any messages meant for SS 116.
  • SS 116 determines whether N_decode is greater than the number of message in the sub-region (i.e., N_decode>N_r?) in block 515.
  • SS 116 records the information in the decoded unicast resource allocation message in block 715. Thereafter, SS 116 proceeds to block 605 on FIGURE 6 to perform the blind decoding process 600.
  • all the multicast resource allocation messages occupy contiguous portions of any sub-region starting from the beginning of that particular sub-region.
  • any resource allocation sub-region that contains both multicast and unicast messages may be thought of as being partitioned into two further non-overlapping portions.
  • the first portion, starting at the beginning of the sub-region, contains only multicast messages, while the second portion, which follows the first portion contiguously in the sub-region, contains only unicast messages.
  • Unicast messages are not present in the first portion, and multicast messages are not present in the second portion. It may be noted that this embodiment applies only to those sub-regions that carry both multicast and unicast messages, and defines the order in which they appear in that sub-region. In such a sub-region, the first portion herein is referred to as the “multicast sub-region” and the second portion herein is referred to as the “unicast sub-region”.
  • the sub-regions in decreasing order of the robustness of the MCS used in the sub-region, i.e., in decreasing order of the degree of protection from radio channel impairments afforded by the MCS used in the sub-region.
  • a more robust MCS is not used to transmit a unicast message to SS 116 as compared to a multicast message transmitted to SS 116.
  • BS 102 can transmit the unicast message to SS 116 using the same MCS, thus affording the same level of protection. Therefore, a unicast resource allocation message meant for SS 116 does not use a more robust MCS than a multicast message to SS 116.
  • the sub-region arrangement is used, all multicast messages for SS 116 appear prior to the first unicast message for SS 116.
  • FIGURE 8 illustrates process for a combination blind decoding by a subscriber station wherein both multicast & unicast resource allocation messages are present in the resource allocation region according to embodiments of the present disclosure.
  • the combination blind decoding process 800 shown in FIGURE 8 is for illustration only. Other embodiments could be used without departing from the scope of this disclosure.
  • an End Indicator is utilized.
  • EI End Indicator
  • the unicast messages meant for a particular subscriber station, such as SS 116 in a sub-region: all unicast messages intended for SS 116 are arranged contiguously in a sub-region; and a particular type of unicast resource allocation to SS 116, if it exists within a sub-region, always occurs last in the sequence of unicast messages meant for SS 116 in that sub-region.
  • This particular unicast resource allocation message type herein is referred to as the EI.
  • BS 102 is sending several unicast resource allocation messages to SS 116, which include one or more messages of the EI type, then all the messages occupy contiguous blocks in a sub-region, with the message of the EI type (or one of the messages of EI type in case there are more than one) being the last.
  • the specific value of the type EI can be agreed to based upon a convention between BS 102 and SS 116, and may not be explicitly conveyed to SS 116.
  • the “type” of a message can be any identifier that allows differentiation among the various unicast resource allocation messages. This includes when the message type is part of the information content of the message. For example, the message type may be the first X bits of the information bits in the message. Then, upon successfully decoding the message (e.g., CRC success), SS 116 can check those first X bits to determine the type of the message SS 116 decoded, following which SS 116 can go on to interpreting the rest of the information bits in the message, maybe depending upon the message type.
  • SS 116 successfully decodes a unicast message of the EI type and determines that the next unicast message in that sub-region is not meant for SS 116, then SS 116 knows that no further unicast messages exist for SS 116 in that sub-region. Further, if blind decoding process 600 and the blind decoding process 700 are in operation, SS 116 also knows that SS 116 has no unicast messages in any of the following sub-regions, and that all multicast messages have already been encountered, respectively. Therefore, SS 116 can terminate the blind decoding operation without even reaching the end of that sub-region.
  • FIGURE 8 illustrates the operation of the combination blind decoding process 800 wherein both multicast & unicast resource allocation messages are present in the resource allocation region.
  • SS 116 determines whether N_decode is greater than the number of message in the sub-region (i.e., N_decode>N_r?) in block 835. If N_decode>N_r, then, in block 835, SS 116 terminates the blind decoding in block 840. No unicast message in any following region is interpreted. Further, all multicast messages also are already encountered. Further, all the messages of type EI have already been encountered. Hence, SS116 can exit the blind decoding process 700.
  • SS 116 selects the next block of size S_r and attempts a decoding operation using MCS M_r. SS 116 determines if the decoding operation was successful by performing a CRC check in block 850. If the CRC check is successful, SS 116 returns to record the information in the decoded unicast message in block 815.
  • SS 116 determines, in block 855, if the EI type message has been detected, that is, determines if the EI_Encountered value is set to “True.” If the EI type message has not been encountered, that is the EI_Encountered value is set to “False,” SS 116 returns to record the information in the decoded unicast message in block 815. If the EI type message has been encountered, that is the EI_Encountered value is set to “False,” SS 116 terminates the blind decoding process in block 860.
  • SS 116 decodes until the end of the sub-region and may not decode following sub-regions. Additionally, since all unicast messages for SS 116 are arranged contiguously, and since the message of type EI has already been encountered, no further unicast messages for SS 116 in the sub-region exist.

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Abstract

Une station de base et une station d'abonné sont capables de communiquer l'une avec l'autre dans un réseau de communication sans fil. La station de base alloue des ressources à la station d'abonné par des messages d'allocation de ressources inclus dans une région d'allocation de ressources d'une communication en liaison descendante. La région d'allocation de ressources est divisée en une pluralité de sous-régions. L'invention porte sur des conventions concernant l'agencement des messages d'allocation de ressources qui permettent à la station d'abonné de décoder les messages d'allocation de ressources contenus dans une sous-région et de cesser les opérations de décodage lorsque la fin de la sous-région est atteinte. En conséquence, la station d'abonné ne décode pas des messages d'allocation de ressources contenus dans des sous-régions subséquentes.
PCT/KR2010/003948 2009-06-19 2010-06-18 Procédé et système d'agencement de messages d'allocation de ressources pour réduire la complexité de décodage à l'aveugle dans des systèmes basés sur ofdma Ceased WO2010147426A2 (fr)

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CN201080027056.6A CN102804897B (zh) 2009-06-19 2010-06-18 用于在基于正交频分多址的系统中排列资源分配消息以降低盲解码复杂度的方法和系统
JP2012515990A JP5684803B2 (ja) 2009-06-19 2010-06-18 直交周波数分割の多重接続方式基盤のシステムにおいてブラインドデコーディングの複雑性を減少させるために資源割当メッセージを配列する方法及びシステム
KR1020117030276A KR101950780B1 (ko) 2009-06-19 2010-06-18 직교주파수분할 다중접속방식 기반의 시스템에서 블라인드 디코딩 복잡성을 감소시키기 위해 자원 할당 메시지를 배열하는 방법 및 시스템

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